Residents can now only hear music from the government-controlled radio station and another Kenya-based UN-funded radio station, which has a FM transmitter in Mogadishu, he says.

"We are using other sounds such as gunfire, the noise of the vehicles and birds to link up our programmes and news," said Abdulahi Yasin Jama, Tusmo radio's head of the programmes.

Another radio controller said he feared they would lose listeners and advertisers.

Pop music is genuinely popular in Mogadishu and many people resent being told what they can hear on the radio, our reporter says.

Last week, al-Shabab, the country's other big militant group, closed down BBC radio relay stations in five cities in southern Somalia, including Mogadishu.

On Tuesday, it issued a statement explaining that it ordered the seizure of BBC transmitters in response to sanctions imposed on the group by the UK government.

But Jerry Timmins, head of the BBC World Service's Africa region, said the equipment belongs to the BBC which is independent of the government.

He said the broadcaster's job was to report impartially and accurately and from all sides, including al-Shabab, and the closures deprived Somalis in the south of a vital source of information.

Meanwhile, the UN has warned that hospitals in Mogadishu are being overwhelmed by casualties from fighting in the city.

World Health Organization spokesman Paul Garwood said that last month alone at least 900 injuries were reported at the city's three main hospitals.

"Health care workers are struggling to cope; they are overwhelmed with the huge increase in wounded. It is stretching an already weak health care system to the limit," Paul Garwood told Reuters news agency.

WHO figures show that only 250 qualified doctors and fewer than 900 nurses are working in Somalia.

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